1、 I 摘要 近年来，一些清洁高效的能源，如太阳能，风能，地热，核能等得到了较为广泛的应用和关注，其 发电系统产生的是直流电流和电压，而许多 负载都使用交流电，因此需要通过逆变器把直流电变成交流电。随着 这些新能源 发电系统的日益推广，逆变器的使用也越来越多。如何获得高质量的电流成为研究的焦点。 由于对高频谐波的抑制效果明显好于 L 型滤波器，因此 LCL 滤波器在并网逆变器中应用越来越广泛，与传统的 L 滤波器相比， LCL 滤波器可以降低电感量，提高系统动态性能，降低成本，在中大功率应用场合，其优势更为明显。 文章首 先对 PWM 逆变器的工作原理做了详细的介绍，并对基于 LCL 的滤波器，
2、在ABC 静止坐标系， 静止坐标系和 dq 旋转坐标系中建立了数学模型。 其次，文章讨论了 LCL 滤波器的参数设计方法，给出了系统 LCL 滤波器参数的设计步骤。 最后，在详细阐述各元件的取值原则与计算步骤的基础上，给出了设计实例，并对所设计的 逆变器 进行了仿真验证，结果表明，根据该方案设计的控制器参数能够使三相并网逆变器安全、可靠运行且具有较快的动态响应速度。 关键词： 并网逆变器 LCL 滤波器 有源阻尼 无源阻尼 ，双闭环控制 II Abstract In recent years, clean and efficient energy sources, such as solar
3、energy, wind energy, geothermal energy, nuclear energy has been widely used and has gained widespread attention .The power system produce the DC current and voltage, and many are using the AC load, it need inverter into alternating current to direct current. With the increasing promotion of photovol
4、taic power generation systems, the use of inverters is more and more. How to get a high quality of the current becomes the focus of research. Because of the inhibitory effect of high frequency harmonics is better than L-type filter, the LCL filter grid inverter is widely applied, compared with the t
5、raditional L-filter, LCL filter can reduce the inductance improve the system dynamic performance, reduce costs, in the high-power applications, its advantages more apparent. This paper analyzes the high frequency PWM inverter principle, and then presents a three-phase ABC coordinates and dq coordina
6、te system on the mathematical model of LCL-filter configuration. Secondly, the article discusses the LCL filter design parameters； parameters of the system are given LCL filter design steps. Finally, each component in detail the principles and calculation steps of the value based on the design examp
7、le is given, and the design of the LCL filter simulation results show that, according to the design of the controller parameters can make three-phase inverter with safe, reliable operation and has a fast dynamic response speed. Key words: Grid-connected inverter， LCL filter， Active damping, passive damping， Double closed loop control
